Darien, WI: PFAS Found in Water - Home Safety 50/100
1 ZIP code · 2 water systems · Updated
ZipCheckup grade for Darien: D.
Federal records show several conditions worth reviewing.
Behind the low grade for Darien, WI is an average of ZIP-level Home Safety Scores, a composite measure rather than a water test.
How Darien Compares
Data: EPA SDWIS
What You Should Know About Darien Water
- Your city's water systems recorded 40 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0014 mg/L.
- Homes built before 1986: 63% - older plumbing may contain lead solder.
- Estimated remediation: $300 per household.
- Health risk index (ZipCheckup composite of CDC data): 12.73.
Who Supplies Your Water in Darien
When a city is linked to 2 water systems, as Darien, WI is in federal records, water in one neighborhood may come from a different system than in another. The 2 systems with the largest reported populations are shown below, and their compliance records are kept separately, so a violation logged for one does not describe the others.
- D
- D
Overview
We track home safety data for 1 ZIP code in Darien, Wisconsin, covering 2 community water systems serving approximately 2,153 people. The EPA snapshots used for this build directly map water systems to 1 of 1 ZIP codes.
1 of 1 ZIP code with a reported violation count in the available EPA record (100%) have recorded EPA violations. 1 health-based violation appear in the available health breakdown.
Home Safety Score
Average Home Safety Score for Darien: D (50/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Darien water systems draw from: Groundwater.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0014 mg/L (EPA action level: 0.015 mg/L)
- 0 of 1 ZIP code with known status exceed the EPA lead action level
Radon Risk
1 of 1 ZIP records with known zones is in EPA Radon Zone 1.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead and Copper Rule | Treatment Technique | 14 | 1 |
| Nitrate | Inorganic | 4 | 1 |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 4 | 1 |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 4 | 1 |
| Consumer Confidence Rule | Reporting | 4 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 53114 | D | 40 | 1 | Sharon Waterworks |
All ZIP Codes in Darien
- 53114 [D] - 40 violations ⚠
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Darien
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Darien Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Darien
With 63% of homes built before 1986, lead solder in plumbing is a potential concern. Federal law banned lead solder in drinking-water plumbing in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Plumbing risk in older housing is tied to the period before 1986, when lead pipes and lead solder were still permitted in new plumbing. Darien's median build year is 1965, and properties from before that year might still contain lead-bearing joints or pipes. Much of that risk sits inside individual properties, which city-level water quality averages don't capture.
Over half of homes in Darien were built before 1986, when federal law began restricting lead solder in drinking-water plumbing. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Darien Homeowners
Low tier for Darien: remediation estimated at up to 1% of what homes are worth.
Estimated remediation costs in Darien can be compared with local home values. The $150–$600 estimated range can be set against the median property value; actual costs vary by home. Home values are 2% below the Wisconsin average.
Lead Exposure Risk for Children in Darien
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Darien
- Test your water at home. City-level data shows averages - your tap may differ. Check the certification, price and turnaround time of any water test kit or lab service.
- Install a certified water filter. For Lead and Copper Rule, listed in the water-quality records for Darien: if it is a rule or reporting requirement rather than a contaminant, ask your utility what the record involved; for bacteria, follow any boil-water notice from your utility; for a specific chemical contaminant, check whether a filter is certified to reduce it. Not every contaminant has a consumer filter certification.
- Check your home's plumbing. With 63% of homes built before 1986, lead solder is a real possibility.
- Review your water system's CCR. If you use a community water system, request its annual Consumer Confidence Report for system-level test results or find it online.
Deep Dive Reports
Detailed analysis for Darien, WI